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c in (-oo:+oo)
-11 > c/2 // - c/2
-(c/2)-11 > 0
-1/2*c-11 > 0 // + 11
-1/2*c > 11 // : -1/2
c < 11/(-1/2)
c < -22
c in (-oo:-22)
(-oo:-22)
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